Pretty decent man. Tho I don't find the nebule to be one of your better ones and also the starfield feels a bit too monotone, as in the original version. Colorscheme is neat tho. Perhaps you should've worked a bit more on this one to get it better.
I'll also add to that though, I can see some nice depth being built up in there that makes it a little less flat than the original, I would just suggest working on the greyed out parts some more to work out that depth further, if you feel like it. Otherwise it's still nice.
I cant think of a thing wrong with this.
Exellent work!
And being asked to let art be exposed in a convention is awesome! Congrats!
Colorscheme is neat tho.
Perhaps you should've worked a bit more on this one to get it better.
Sorry for the rather harsh words mate
/rob